The purpose of this study is to assess a relatively new PET (Positron emission tomography) radiotracer called FACBC in the assessment of head and neck cancer. FDG (Flourine Deoxyglucose) is currently used for PET imaging, but has limitations in head and neck cancer. These limitations include problems with specificity, high background uptake from normal structures, difficulty delineating intracranial invasion, and the need to wait several weeks after chemotherapy and radiation before imaging. As an amino acid radiotracer, rather than a glucose radiotracer, FACBC overcomes some of these limitations. FACBC does not yet have FDA (Food and Drug Administration) approval, but does show promise in initial work in patients with prostate cancer and brain tumors. Dosimetry work on FACBC has been performed at Emory.